Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 173gr | RWS H-Mantel bullet and 40 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2218, Vihtavuori N570 and Alliant Reloder-50.
Important Notice: DO NOT go below Minimum Charge or above Maximum Charge. Since we have no control over the equipment and components used, any responsibility and liability for the results achieved is rejected.
Only powders/loads that match the current filter criteria are displayed: max pressure of a load ≤ 90% of max. standardized pressure, fill rate ≥ 80% and propellant combustion ≥ 95%. Use the sliders above the tables to adjust these thresholds.
Charge: Powder weight in grains. Start with the minimum load and work up carefully.
FR (Fill Rate): Case fill as a percentage. Values above 100% mean compressed loads.
MaxP / %: Maximum chamber pressure in bar and as a percentage of the standardized maximum for this caliber.
V(0): Muzzle velocity in feet per second (fps) at the standardized barrel length.
z (Powder Burn): Estimated propellant combustion percentage at bullet exit.
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Max Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 82% | 56,130 psi | 88% | 2851 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 56,927 psi | 89% | 2979 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 82% | 55,912 psi | 88% | 2963 fps | 100% |
| ADI AR 2217 | <<locked>> | 90% | 55,927 psi | 88% | 2953 fps | 100% |
| ADI AR 2218 | <<locked>> | 94% | 56,608 psi | 89% | 3091 fps | 99.7% |
| ADI AR 2225 | <<locked>> | 92% | 56,115 psi | 88% | 2976 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 56,521 psi | 89% | 2956 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 82% | 54,882 psi | 86% | 2851 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 55,956 psi | 88% | 2936 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 54,752 psi | 86% | 2995 fps | 99.3% |
| Alliant Reloder-50 | <<locked>> | 94% | 55,187 psi | 86% | 2995 fps | 99% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 55,680 psi | 87% | 2923 fps | 99.5% |
| Bofors RP15 | <<locked>> | 84% | 55,941 psi | 88% | 2943 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 56,028 psi | 88% | 2966 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 56,521 psi | 89% | 2956 fps | 100% |
| Hodgdon H1000 | <<locked>> | 88% | 57,116 psi | 90% | 2966 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 82% | 57,000 psi | 89% | 2933 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 56,217 psi | 88% | 3038 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,232 psi | 60% | 1903 fps | 100% |
| Hodgdon US 869 | <<locked>> | 98% | 57,363 psi | 90% | 2979 fps | 96.1% |
| IMR 4955 Enduron | <<locked>> | 82% | 57,638 psi | 90% | 2917 fps | 100% |
| IMR 7828 SSC | <<locked>> | 82% | 54,592 psi | 86% | 2946 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 56,463 psi | 88% | 2884 fps | 97.3% |
| IMR 8133 Enduron | <<locked>> | 94% | 54,969 psi | 86% | 2966 fps | 100% |
| Lovex S071 | <<locked>> | 86% | 54,810 psi | 86% | 2835 fps | 100% |
| Norma 217 | <<locked>> | 94% | 56,637 psi | 89% | 2986 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 56,217 psi | 88% | 2972 fps | 100% |
| Ramshot Magnum | <<locked>> | 84% | 54,592 psi | 86% | 2894 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,262 psi | 62% | 1946 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 56,797 psi | 89% | 3015 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 55,854 psi | 88% | 2995 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 54,404 psi | 85% | 2920 fps | 98.6% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 51,750 psi | 81% | 2894 fps | 96.8% |
| Vihtavuori N165 | <<locked>> | 84% | 56,637 psi | 89% | 2877 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 56,289 psi | 88% | 2923 fps | 98.5% |
| Vihtavuori N565 | <<locked>> | 86% | 57,667 psi | 90% | 2979 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 56,144 psi | 88% | 2999 fps | 99.9% |
| Vihtavuori N570 | <<locked>> | 90% | 57,711 psi | 90% | 3068 fps | 99.4% |
| Winchester StaBALL HD | <<locked>> | 82% | 56,608 psi | 89% | 2949 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 56,173 psi | 88% | 2884 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 52,431 psi | 82% | 2799 fps | 100% |
| Accurate 8700 | <<locked>> | 90% | 39,276 psi | 62% | 2651 fps | 95% |
| ADI AR 2213 | <<locked>> | 80% | 52,112 psi | 82% | 2900 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 39,320 psi | 62% | 2654 fps | 98.9% |
| ADI AR 2218 | 87.6 gr | 84% | 39,044 psi | 61% | 2730 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 80% | 36,724 psi | 58% | 2631 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 52,823 psi | 83% | 2894 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 51,445 psi | 81% | 2802 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 45,701 psi | 72% | 2772 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 82% | 40,654 psi | 64% | 2723 fps | 96.1% |
| Alliant Reloder-50 | 91.1 gr | 86% | 41,205 psi | 65% | 2726 fps | 95.6% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 48,936 psi | 77% | 2805 fps | 98.5% |
| Bofors RP15 | <<locked>> | 80% | 49,226 psi | 77% | 2835 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 42,670 psi | 67% | 2730 fps | 99.4% |
| Bofors RP5 | <<locked>> | 80% | 52,823 psi | 83% | 2894 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 42,873 psi | 67% | 2726 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 80% | 53,272 psi | 83% | 2874 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 80% | 45,237 psi | 71% | 2854 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,761 psi | 45% | 1703 fps | 100% |
| Hodgdon US 869 | <<locked>> | 96% | 53,432 psi | 84% | 2910 fps | 95.1% |
| IMR 4955 Enduron | <<locked>> | 80% | 54,172 psi | 85% | 2864 fps | 100% |
| IMR 7828 SSC | <<locked>> | 80% | 51,039 psi | 80% | 2887 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 84% | 49,588 psi | 78% | 2766 fps | 95.7% |
| IMR 8133 Enduron | <<locked>> | 80% | 34,156 psi | 54% | 2549 fps | 97.2% |
| Lovex S071 | <<locked>> | 80% | 45,411 psi | 71% | 2684 fps | 100% |
| Norma 217 | <<locked>> | 80% | 34,853 psi | 55% | 2579 fps | 99.2% |
| Ramshot Grand | <<locked>> | 80% | 52,083 psi | 82% | 2907 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 47,152 psi | 74% | 2776 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,602 psi | 46% | 1742 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 45,121 psi | 71% | 2828 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 41,408 psi | 65% | 2730 fps | 98.3% |
| SNPE Vectan SP 13 | <<locked>> | 90% | 41,394 psi | 65% | 2677 fps | 95.4% |
| Vihtavuori 20N29 | <<locked>> | 98% | 48,095 psi | 75% | 2825 fps | 95.8% |
| Vihtavuori N165 | <<locked>> | 80% | 49,719 psi | 78% | 2769 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 42,946 psi | 67% | 2677 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 80% | 47,181 psi | 74% | 2802 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 80% | 42,250 psi | 66% | 2740 fps | 98% |
| Vihtavuori N570 | 81.7 gr | 80% | 40,306 psi | 63% | 2730 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 52,649 psi | 83% | 2894 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 52,475 psi | 82% | 2828 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 40 powders for 7 mm KM Katzmaier loaded with the .284 | 173gr | RWS H-Mantel. ADI AR 2218 delivers the highest muzzle velocity at 3,091 fps; across all powders the maximum-charge window runs from 1,903 fps to 3,091 fps. Accurate 8700 gives the best case fill at 100 %, and 40 of the 40 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 60–90 %, leaving at least 10 % headroom. The 173.0 gr projectile in 0.284" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, Hodgdon TrailBoss, ReloadSwiss RS 14 reach 100 % fill or more at maximum charge, so these are compressed loads: they need a long drop tube to seat cleanly and react sensitively to the case capacity of your own brass lot. ADI AR 2218, Vihtavuori N570, Alliant Reloder-50 rank at the top here: for 7 mm KM Katzmaier with the .284 | 173gr | RWS H-Mantel they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.